OBID
i-scan
®
UHF
Manual
ID ISC.MU02.02
FEIG ELECTRONIC GmbH
Page 16 of 96
H90701-3e-ID-B
6.1. Serial Data Format and Protocol Frames
The Reader ID ISC.MU02.02 can be configured by different interfaces and data may be written on
Transponders or read from Transponders. The communication between Reader and connected
host (terminal, PC, etc.) is executed by means of fixed protocols. The used protocol is intended for
data bus use and is equipped with a bus address.
During data transfer via the asynchronous interface the Reader supplies the required data or a
status byte. The reply contains the transmitted control byte.
There is no reply from the Reader if there is a protocol frame failure.
Protocol frame: Standard Protocol-Length (up to 255 Byte)
Host
→
Reader
1
2
3
4...n-2
n-1
n
LENGTH =
n
COM-ADR
CONTROL-
BYTE
(DATA)
LSB
CRC16
MSB
CRC16
Host
←
Reader
1
2
3
4
(5...n-2)
n-1
n
LENGTH
(n)
COM-ADR
CONTROL-
BYTE
STATUS
(DATA)
LSB
CRC16
MSB
CRC16
Protocol frame: Advanced Protocol-Length
Reader
←
Host
1
2
3
4
5
(6...n-2)
STX
(0x02)
MSB
ALENGTH
LSB
ALENGTH
COM-ADR
CONTROL-
BYTE
(DATA)
n-1
n
LSB
CRC16
MSB
CRC16
Host
←
Reader
1
2
3
4
5
6
(7...n-2)
STX
(0x02)
MSB
ALENGTH
LSB
ALENGTH
COM-ADR
CONTROL-
BYTE
STATUS
(DATA)
n-1
n
LSB
CRC16
MSB
CRC16
